Platypus GravityWorks 6L Filter System Review
May 15, 2020 at 10:17 pm #3647533Backpacking LightAdmin
@backpackinglightLocale: Rocky MountainsMay 16, 2020 at 8:54 pm #3647646Hanz BBPL Member
“”Also, nominal pore sizes are an average over a distribution. The width of that distribution matters greatly to actual filter performance”
is this a know issue with other commonly used filter brands or something I should be aware of?May 19, 2020 at 7:36 am #3648055Drew SmithBPL Member
@drewsmithLocale: Colorado Rockies
This is a property of all filters. There is no manufacturing process that produces pores of absolutely uniform size. This is why the EPA standards are 99.9999% and not 100% filtration of bacteria. Your best bet is to only buy filters or other treatments which meet this standard.
Don’t let this freak you out. Ingesting a few bacteria or Protozoa rarely leads to illness in immune competent adults. The minimal infectious dose (the amount required to infect 50% of healthy adults) is thought to be around 10 for giardia cysts and 100 for enteric bacteria that cause diarrheal disease. Those numbers are also averages around a distribution but you get the idea. It would take a fairly epic filter fail in heavily contaminated water to make you sick. Most of the time, anyway.
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